Charles g



(No Model.)

O. G. PERKINS;

ELBGTRIO INGANDESOBN'I LAMP AND HOLDER.

No. 287,314. Patented Oct. 28, 1883.

Fil cl.

ATTESTJ V mvnrroa:

WM 6mw- I y UNITED STATES PATENT OFFICE.

CHARLES G. PERKINS, OF NEXV YORK, N. Y., ASSIGNOR TO THE IMPERIALELECTRIC LIGHT COMPANY, OF SAME PLACE.

ELECTRIC INCANDESCENT LAMP AND HOLDER.

SPECIFICATION forming part of Letters Patent No. 287,514, dated October28, 1883.

7 Application filed May 0,1883. (No model.)

To all whom it may concern:

Be it known that 1, CHARLES G. PERKINS, a citizen of the United States,and a resident of New York, in the county of New York and State of NewYork, have invented certain new and useful Improvements in ElectricIncandescent Lamps and Holders, of which the lollowing is aspecification:

Myinvention relates to an eleetricincandescent lamp and holder adaptedfor an electro lier.

In my former applications for Letters Patcut for electric incandescentlamps, with plasterof-paris within the neck of the globe, no means wereprovided for arresting the downward radiation of heat, which wouldevidently arise from several carbons illuminating at the same time, andin time theplastenotparis would convey the heat to the delicatemechanism forming the switch, and cause the several parts to warp andultimately destroy the same. This objection is obviated by first placingwithin the wall 01' the neck of an (310(- trie incandescent lamp asuitable (piantity of mineral wool or other nonconducting mate rial, theresult of which prevents the down ward radiation of the heat asgenerated by the illuminated carbons within the globe, of which a fulldescription will be given hereinafter.

The first part of my invention. consists in arranging within the neck ofan incandescent lamp a suitable quantity of mineral wool sup ported atthe top and bottom by disks of paper or other suitable material, thewhole supported by plaster-of-paris, having a central projectingmetallic screw, and a cylindrical metallic projection provided with anannular bevel projecting below the base of the lamp.

The second part of my invention consists of a hollow ease of acylindrical shape, open at both ends. The upper on d is provided with abevel projection integraltherewith, and corresponding with a metallicsleeve made in halves and mounted on said bevel projection.

The third part of my invention consists of a disk made of insulatingmaterial, mounted with a straddle-screw nut and two flat springs, one ofwhich is electrically connected with the metallic straddle-screw nut,while the other is electrically connected with the metallic rings madein halves by an upright spring provided with a depression correspondingwith a bead integral with the lower portion of the afore said metallicring in halves, the whole mounted on a glass base provided with acentral metallic sleeve provided with screw-threads 011 the innercircumference, at the lower portion thereof, while the upper. endthereof is pro vided wit-h screw-threads on its outer circumferencecorresponding with the threads in the disk of insulating material.

In the drawings, Fi ure 1 represents a vertieal section of an electricincandescent lamp, showing the principle features of my invention. Fig.2 represents a vertical section of the lampholder. Fig. 3 represents theplug of plaster-of-paris, with metallic bevel-edged ring and centralmetallic screw attached thereto. Fig. 4 represents one-half of themetallic sleeve. Fig. 5 represents a plan view of the disk of insulatingmaterial, with flat springs and straddle-screw nut connected therewith.Fig. 6 represents a detail view of the flat metallic spring providedwith an upright integral therewith, and which forms one conneetion forthe circuit of the lamp.

Similar letters referto similar parts throughout the several views, inwhich (1 represents the globe of an electric incandescent lamp.

I) is the neck, and c is the mineral wool, supported therein by thedisks (2 d.

c is the plug of plaster-of-paris, having the cylindrical metalli c projectionf, provided with the lJGVGbGdgGf, and also containing a centralmetallic screw, g, the whole held within' the neck I) by theplaster-otparis 71.

L i are the electrical conductors, one of which is electricallyconnected with the central screw,

g. The other is connected with the metallic o projectionf.

it represents the glass case, mounted'on the glass base Z.

k is the beveled projection of the glass case 7., and k is one-half ofthe metallic sleeve, 5 provided with an annular bead, on, on, the lowerportion thereof.

a is the disk of insulating material, having a metallic straddle-screwnut, a, connected therewith. One arm of the straddle-screw IOO nut a iselectrically connected with the flat spring 0, provided with adepression, 0, on

the under side thereof, near the end, in which one of the electricalconductors, 1, leading to the main-line wire, is held.

1) is the second flat spring, fastened to disk 5 n. This spring is alsoprovided with a depression, 11 on the under side thereof, near its end,for holding the other electrical conductor, 2, in position, and at thesame time making a perfect electrical contact therewith. The spring p isalso provided with a perpendicular spring, 1), integral therewith, andis also providedwith a depression, 1)", corresponding with the bead, m,of the metallic sleeve k, with which the said springp makes an electrical contact. Z is the metallic sleeve holding the disk at and base Ztogether. WVhenever the lainpand holder shall have been completed, thetwo are joined together by inserting the central screw in thestraddlescrew nut, and then turning the lamp until the beveled edge ofthe metallic projection of the lampv shall have made a perfectelectrical contact with the corresponding bevel on the metallic sleevearranged on the beveled pro- 25 jection of the glass case forming partofthe lamp-holder. \Vhen thelamp and holder shall have been mounted on theextending arms of an electrolier, the current will then travel throughthe wire 1 to the metallic flat spring 0, thence through thestraddle-screw nut n, to the central screw, 9, from which it travels tothe conductor 1', leading to the carbon filament, through which itpasses to the conductor i, thence to the metallic cylindrical projection3 f, to the metallic sleeve k, from whichit passes to the perpendicularsprin g p, and then cc to the flat spring 1), to the wire 2, leading tothe mainline wire, thus completing the circuit through the lamp andholder.

Having thus described my invention, what I 'cent lamp, the mineral woolc, disksd d, plaster-of-paris plug 0, cylindrical metallic projection f,beveled edge f, metallic screw 9, and the electrical COIldllGtOISi i,the whole arranged within the neck I), substantially as shown anddescribed. 7

4. In combination with an electric incandescent lamp holder, the case k,beveled projec= tion 7c, metallic sleeve k", and bead m, forming a partof the circuit-connections of the lamp, substantially as shown anddescribed.

5. In combination with an electric incandescent lamp, the disk n,fastened to the glass base Z by the metallic sleeve 1 straddle-screw nutn, fastened to said disk n, the flat metallie springs 0 19, providedwith depressions 0 19 for holding the leading-in wires into position andmaking a perfect electrical contact therewith, and the upright 12,integral with th e flat spring 1), and having a depression near itsupper end corresponding and engaging with the bead m of the metallicsleeve is, mounted on the ease k, substantially as shown and described.

Signed at New York, in the county of New York and State of New York.

' CHARLES G. PERKINS.

\Vitnesses:

J. A. HURDLE,

GEORGE BECKER.

